breast cancer screening

When should women at average risk for breast cancer start mammography screenings? Should they start at 40, or is it better to wait until 50? The U.S. Preventive Services Task Force has weighed in, concluding that "cancer mortality is generally reduced" with screening. But other issues need answers.
The U.S. Preventive Service Task Force (USPSTF) evaluates evidence and provides screening guidelines for a number of diseases, including breast cancer. It has just updated its previous guidelines for breast cancer screening in women who have no personal history of cancer, but have a family history that indicates an increased likelihood of potentially harmful BRCA-related cancers.